Update legacy Checks tutorial & sample code

Clean up legacy Checks tutorials

Author: mDuo13

@i18n/es-ES/docs/concepts/payment-types/checks.md

@@ -49,10 +49,9 @@ Para más información sobre Cheques en el XRP Ledger, ver:
     - [CheckCreate][]
     - [CheckCash][]
     - [CheckCancel][]
-- [Tutoriales de cheques](../../tutorials/how-tos/use-specialized-payment-types/use-checks/use-checks.md)
+- [Tutoriales de cheques](../../tutorials/how-tos/use-specialized-payment-types/use-checks/index.md)
     - [Enviar un cheque](../../tutorials/how-tos/use-specialized-payment-types/use-checks/send-a-check.md)
-    - [Buscar cheques por dirección del remitente](../../tutorials/how-tos/use-specialized-payment-types/use-checks/look-up-checks-by-sender.md)
-    - [Buscar cheques por dirección del destinatario](../../tutorials/how-tos/use-specialized-payment-types/use-checks/look-up-checks-by-recipient.md)
+    - [Buscar cheques](../../tutorials/how-tos/use-specialized-payment-types/use-checks/look-up-checks.md)
     - [Canjear un cheque por la cantidad exacta](../../tutorials/how-tos/use-specialized-payment-types/use-checks/cash-a-check-for-an-exact-amount.md)
     - [Canjear un cheque por una cantidad flexible](../../tutorials/how-tos/use-specialized-payment-types/use-checks/cash-a-check-for-a-flexible-amount.md)
     - [Cancelar un cheque](../../tutorials/how-tos/use-specialized-payment-types/use-checks/cancel-a-check.md)

@i18n/ja/docs/concepts/payment-types/checks.md

@@ -97,10 +97,9 @@ XRP LedgerのChecksの詳細は、以下をご覧ください。
     - [CheckCreate][]
     - [CheckCash][]
     - [CheckCancel][]
-- [Checksのチュートリアル](../../tutorials/how-tos/use-specialized-payment-types/use-checks/use-checks.md)
+- [Checksのチュートリアル](../../tutorials/how-tos/use-specialized-payment-types/use-checks/index.md)
     - [Checkの送信](../../tutorials/how-tos/use-specialized-payment-types/use-checks/send-a-check.md)
-    - [送金元アドレスに基づくChecksの検索](../../tutorials/how-tos/use-specialized-payment-types/use-checks/look-up-checks-by-sender.md)
-    - [受取人アドレスに基づくChecksの検索](../../tutorials/how-tos/use-specialized-payment-types/use-checks/look-up-checks-by-recipient.md)
+    - [Checksの検索](../../tutorials/how-tos/use-specialized-payment-types/use-checks/look-up-checks.md)
     - [Checkの指定された金額での換金](../../tutorials/how-tos/use-specialized-payment-types/use-checks/cash-a-check-for-an-exact-amount.md)
     - [Checkの変動金額での換金](../../tutorials/how-tos/use-specialized-payment-types/use-checks/cash-a-check-for-a-flexible-amount.md)
     - [Checkの取消し](../../tutorials/how-tos/use-specialized-payment-types/use-checks/cancel-a-check.md)